Engines
Lycoming Boosts Time Between Overhaul to 2,600 Hours
New intervals based on endurance testing and fleet data
Lycoming Engines
© Lycoming Engines

Lycoming Engines has released Service Instruction (SI) 1009BF, which outlines increased recommended time between overhaul (TBO) intervals for a variety of piston aircraft engines. While SI 10009BF expands many engines’ TBO hours from 2,000 hours to 2,600 hours, Lycoming retained its recommendation for 12-year calendar TBO intervals.

The longer 2,600-hour TBO applies to O‑320, IO‑320, O‑360, IO‑360, IO‑390, O‑540, and IO‑540 series engines “when operated and maintained in accordance with all applicable Lycoming technical publications and FAA airworthiness requirements.” This means, according to SI 10009BF, the TBO extensions do no apply to engines that incorporate “other than genuine Lycoming parts” or parts or engines that “have been maintained or overhauled using methods other than Lycoming-approved procedures.”

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